The Aqueon Modular LED Aquarium Light Fixture, 30 inch, takes LED lighting a step forward. The Modular LED Light comes with a single Day White LED "lamp" and two expansion slots for more lamps. The LED lamps easily snap into the fixture. This design allows you to choose the color combinations best for your needs and also allows you to replace LED lamps (LEDs will not last forever). This gives you all the advantages of lamps while still benefiting from the durability, low energy usage and low heat of LEDs.